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// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; tab-width: 8 -*-
//
// clamp.h: Rcpp R/C++ interface class library -- clamp
//
// Copyright (C) 2012 Dirk Eddelbuettel and Romain Francois
//
// This file is part of Rcpp.
//
// Rcpp is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 2 of the License, or
// (at your option) any later version.
//
// Rcpp is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Rcpp. If not, see <http://www.gnu.org/licenses/>.
#ifndef Rcpp__sugar__clamp_h
#define Rcpp__sugar__clamp_h
namespace Rcpp{
namespace sugar{
template <int RTYPE, bool NA>
struct clamp_operator{
typedef typename Rcpp::traits::storage_type<RTYPE>::type STORAGE ;
clamp_operator(STORAGE lhs_, STORAGE rhs_ ) : lhs(lhs_), rhs(rhs_){}
inline STORAGE operator()(STORAGE x) const {
return x < lhs ? lhs : (x > rhs ? rhs : x ) ;
}
STORAGE lhs, rhs ;
} ;
// need to write this special version
template <>
struct clamp_operator<REALSXP,true> {
clamp_operator(double lhs_, double rhs_ ) : lhs(lhs_), rhs(rhs_){}
inline double operator()(double x) const {
if( Rcpp::traits::is_na<REALSXP>(x) ) return x ;
return x < lhs ? lhs : (x > rhs ? rhs : x ) ;
}
double lhs, rhs ;
} ;
template <
int RTYPE,
bool NA, typename T
>
class Clamp_Primitive_Vector_Primitive : public VectorBase<
RTYPE ,
NA ,
Clamp_Primitive_Vector_Primitive<RTYPE,NA,T>
> {
public:
typedef typename Rcpp::traits::storage_type<RTYPE>::type STORAGE ;
typedef clamp_operator<RTYPE,NA> OPERATOR ;
Clamp_Primitive_Vector_Primitive( STORAGE lhs_, const T& vec_, STORAGE rhs_) : vec(vec_), op(lhs_,rhs_) {}
inline STORAGE operator[]( R_xlen_t i ) const {
return op( vec[i] ) ;
}
inline R_xlen_t size() const { return vec.size() ; }
private:
const T& vec ;
OPERATOR op ;
} ;
} // sugar
template <int RTYPE, bool NA, typename T>
inline sugar::Clamp_Primitive_Vector_Primitive<RTYPE,NA,T>
clamp(
typename Rcpp::traits::storage_type<RTYPE>::type lhs,
const Rcpp::VectorBase<RTYPE,NA,T>& vec,
typename Rcpp::traits::storage_type<RTYPE>::type rhs
){
return sugar::Clamp_Primitive_Vector_Primitive<RTYPE,NA,T>( lhs, vec.get_ref(), rhs ) ;
}
} // Rcpp
#endif
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